Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska

A. Matmon; D. P. Schwartz; P. J. Haeussler; R. Finkel; J. J. Lienkaemper; H. D. Stenner; T. E. Dawson

doi:10.1130/G22361.1

Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska

A. Matmon^*, D. P. Schwartz, P. J. Haeussler, R. Finkel, J. J. Lienkaemper, H. D. Stenner, T. E. Dawson

^*Corresponding author for this work

Fredy & Nadine Herrmann Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

104 Scopus citations

Abstract

The Denali fault is the principal intracontinental strike-slip fault accommodating deformation of interior Alaska associated with the Yakutat plate convergence. We obtained the first quantitative late Pleistocene-Holocene slip rates on the Denali fault system from dating offset geomorphic features. Analysis of cosmogenic ¹⁰Be concentrations in boulders (n = 27) and sediment (n = 13) collected at seven sites, offset 25-170 m by the Denali and Totschunda faults, gives average ages that range from 2.4 ± 0.3 ka to 17.0 ± 1.8 ka. These offsets and ages yield late Pleistocene-Holocene average slip rates of 9.4 ± 1.6, 12.1 ± 1.7, and 8.4 ± 2.2 mm/yr^-1 along the western, central, and eastern Denali fault, respectively, and 6.0 ± 1.2 mm/yr^-1 along the Totschunda fault. Our results suggest a westward decrease in the mean Pleistocene-Holocene slip rate. This westward decrease likely results from partitioning of slip from the Denali fault system to thrust faults to the north and west.

Original language	English
Pages (from-to)	645-648
Number of pages	4
Journal	Geology
Volume	34
Issue number	8
DOIs	https://doi.org/10.1130/G22361.1
State	Published - Aug 2006

Keywords

Cosmogenic isotopes
Denali fault
Offset moraines
Slip rates

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title = "Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska",

abstract = "The Denali fault is the principal intracontinental strike-slip fault accommodating deformation of interior Alaska associated with the Yakutat plate convergence. We obtained the first quantitative late Pleistocene-Holocene slip rates on the Denali fault system from dating offset geomorphic features. Analysis of cosmogenic 10Be concentrations in boulders (n = 27) and sediment (n = 13) collected at seven sites, offset 25-170 m by the Denali and Totschunda faults, gives average ages that range from 2.4 ± 0.3 ka to 17.0 ± 1.8 ka. These offsets and ages yield late Pleistocene-Holocene average slip rates of 9.4 ± 1.6, 12.1 ± 1.7, and 8.4 ± 2.2 mm/yr-1 along the western, central, and eastern Denali fault, respectively, and 6.0 ± 1.2 mm/yr-1 along the Totschunda fault. Our results suggest a westward decrease in the mean Pleistocene-Holocene slip rate. This westward decrease likely results from partitioning of slip from the Denali fault system to thrust faults to the north and west.",

keywords = "Cosmogenic isotopes, Denali fault, Offset moraines, Slip rates",

author = "A. Matmon and Schwartz, {D. P.} and Haeussler, {P. J.} and R. Finkel and Lienkaemper, {J. J.} and Stenner, {H. D.} and Dawson, {T. E.}",

year = "2006",

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doi = "10.1130/G22361.1",

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AU - Matmon, A.

AU - Schwartz, D. P.

AU - Haeussler, P. J.

AU - Finkel, R.

AU - Lienkaemper, J. J.

AU - Stenner, H. D.

AU - Dawson, T. E.

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N2 - The Denali fault is the principal intracontinental strike-slip fault accommodating deformation of interior Alaska associated with the Yakutat plate convergence. We obtained the first quantitative late Pleistocene-Holocene slip rates on the Denali fault system from dating offset geomorphic features. Analysis of cosmogenic 10Be concentrations in boulders (n = 27) and sediment (n = 13) collected at seven sites, offset 25-170 m by the Denali and Totschunda faults, gives average ages that range from 2.4 ± 0.3 ka to 17.0 ± 1.8 ka. These offsets and ages yield late Pleistocene-Holocene average slip rates of 9.4 ± 1.6, 12.1 ± 1.7, and 8.4 ± 2.2 mm/yr-1 along the western, central, and eastern Denali fault, respectively, and 6.0 ± 1.2 mm/yr-1 along the Totschunda fault. Our results suggest a westward decrease in the mean Pleistocene-Holocene slip rate. This westward decrease likely results from partitioning of slip from the Denali fault system to thrust faults to the north and west.

AB - The Denali fault is the principal intracontinental strike-slip fault accommodating deformation of interior Alaska associated with the Yakutat plate convergence. We obtained the first quantitative late Pleistocene-Holocene slip rates on the Denali fault system from dating offset geomorphic features. Analysis of cosmogenic 10Be concentrations in boulders (n = 27) and sediment (n = 13) collected at seven sites, offset 25-170 m by the Denali and Totschunda faults, gives average ages that range from 2.4 ± 0.3 ka to 17.0 ± 1.8 ka. These offsets and ages yield late Pleistocene-Holocene average slip rates of 9.4 ± 1.6, 12.1 ± 1.7, and 8.4 ± 2.2 mm/yr-1 along the western, central, and eastern Denali fault, respectively, and 6.0 ± 1.2 mm/yr-1 along the Totschunda fault. Our results suggest a westward decrease in the mean Pleistocene-Holocene slip rate. This westward decrease likely results from partitioning of slip from the Denali fault system to thrust faults to the north and west.

KW - Cosmogenic isotopes

KW - Denali fault

KW - Offset moraines

KW - Slip rates

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Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska

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Keywords

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